Moved gsf.testrunner stuff to a separate package.
Added another test to PluginClassImplementation.
Added Yenta and gsf testrunner as a dependency.
GradleTestSession now relies Yenta instead of reflection. Note that Yenta is actually copied instead of being depended on because I had trouble installing the plugin this way (when depending on Yenta).
Task options can now be added to the task list
Test/Debug single method now specifies "--tests" in the task list as it is more appropriate.